/*
 * Copyright (c) 2001-2008 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jgoodies.looks.plastic;

import javax.swing.*;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.metal.MetalScrollBarUI;
import java.awt.*;


/**
 * The JGoodies Plastic L&amp;F implementation of <code>ScrollBarUI</code>.
 * Can add a pseudo 3D effect and honors the Plastic Option
 * <tt>ScrollBar.maxBumpsWidth</tt> to limit the with of the scroll bar bumps.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.6 $
 */

public final class PlasticScrollBarUI extends MetalScrollBarUI {

    private static final String PROPERTY_PREFIX = "ScrollBar.";
    public static final String MAX_BUMPS_WIDTH_KEY = PROPERTY_PREFIX + "maxBumpsWidth";

    private Color shadowColor;
    private Color highlightColor;
    private Color darkShadowColor;
    private Color thumbColor;
    private Color thumbShadow;
    private Color thumbHighlightColor;

    private PlasticBumps bumps;

    public static ComponentUI createUI(JComponent b) {
        return new PlasticScrollBarUI();
    }


    protected void installDefaults() {
        super.installDefaults();
        bumps = new PlasticBumps(10, 10, thumbHighlightColor, thumbShadow, thumbColor);
    }


    protected JButton createDecreaseButton(int orientation) {
        decreaseButton = new PlasticArrowButton(orientation, scrollBarWidth, isFreeStanding);
        return decreaseButton;
    }


    protected JButton createIncreaseButton(int orientation) {
        increaseButton = new PlasticArrowButton(orientation, scrollBarWidth, isFreeStanding);
        return increaseButton;
    }


    protected void configureScrollBarColors() {
        super.configureScrollBarColors();
        shadowColor = UIManager.getColor(PROPERTY_PREFIX + "shadow");
        highlightColor = UIManager.getColor(PROPERTY_PREFIX + "highlight");
        darkShadowColor = UIManager.getColor(PROPERTY_PREFIX + "darkShadow");
        thumbColor = UIManager.getColor(PROPERTY_PREFIX + "thumb");
        thumbShadow = UIManager.getColor(PROPERTY_PREFIX + "thumbShadow");
        thumbHighlightColor = UIManager.getColor(PROPERTY_PREFIX + "thumbHighlight");
    }


    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
        g.translate(trackBounds.x, trackBounds.y);

        boolean leftToRight = PlasticUtils.isLeftToRight(c);

        if (scrollbar.getOrientation() == Adjustable.VERTICAL) {
            if (!isFreeStanding) {
                if (!leftToRight) {
                    trackBounds.width += 1;
                    g.translate(-1, 0);
                } else {
                    trackBounds.width += 2;
                }
            }

            if (c.isEnabled()) {
                g.setColor(darkShadowColor);
                g.drawLine(0, 0, 0, trackBounds.height - 1);
                g.drawLine(trackBounds.width - 2, 0, trackBounds.width - 2, trackBounds.height - 1);
                g.drawLine(1, trackBounds.height - 1, trackBounds.width - 1, trackBounds.height - 1);
                g.drawLine(1, 0, trackBounds.width - 2, 0);

                g.setColor(shadowColor);
                //	g.setColor( Color.red);
                g.drawLine(1, 1, 1, trackBounds.height - 2);
                g.drawLine(1, 1, trackBounds.width - 3, 1);
                if (scrollbar.getValue() != scrollbar.getMaximum()) { // thumb shadow
                    int y = thumbRect.y + thumbRect.height - trackBounds.y;
                    g.drawLine(1, y, trackBounds.width - 1, y);
                }
                g.setColor(highlightColor);
                g.drawLine(trackBounds.width - 1, 0, trackBounds.width - 1, trackBounds.height - 1);
            } else {
                PlasticUtils.drawDisabledBorder(g, 0, 0, trackBounds.width, trackBounds.height);
            }

            if (!isFreeStanding) {
                if (!leftToRight) {
                    trackBounds.width -= 1;
                    g.translate(1, 0);
                } else {
                    trackBounds.width -= 2;
                }
            }
        } else { // HORIZONTAL
            if (!isFreeStanding) {
                trackBounds.height += 2;
            }

            if (c.isEnabled()) {
                g.setColor(darkShadowColor);
                g.drawLine(0, 0, trackBounds.width - 1, 0); // top
                g.drawLine(0, 1, 0, trackBounds.height - 2); // left
                g.drawLine(0, trackBounds.height - 2, trackBounds.width - 1, trackBounds.height - 2);
                // bottom
                g.drawLine(trackBounds.width - 1, 1, trackBounds.width - 1, trackBounds.height - 1);

                // right
                g.setColor(shadowColor);
                //	g.setColor( Color.red);
                g.drawLine(1, 1, trackBounds.width - 2, 1); // top
                g.drawLine(1, 1, 1, trackBounds.height - 3); // left
                g.drawLine(0, trackBounds.height - 1, trackBounds.width - 1, trackBounds.height - 1);
                // bottom
                if (scrollbar.getValue() != scrollbar.getMaximum()) { // thumb shadow
                    int x = thumbRect.x + thumbRect.width - trackBounds.x;
                    g.drawLine(x, 1, x, trackBounds.height - 1);
                }
            } else {
                PlasticUtils.drawDisabledBorder(g, 0, 0, trackBounds.width, trackBounds.height);
            }

            if (!isFreeStanding) {
                trackBounds.height -= 2;
            }
        }
        g.translate(-trackBounds.x, -trackBounds.y);
    }


    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
        if (!c.isEnabled()) {
            return;
        }

        boolean leftToRight = PlasticUtils.isLeftToRight(c);

        g.translate(thumbBounds.x, thumbBounds.y);

        if (scrollbar.getOrientation() == Adjustable.VERTICAL) {
            if (!isFreeStanding) {
                if (!leftToRight) {
                    thumbBounds.width += 1;
                    g.translate(-1, 0);
                } else {
                    thumbBounds.width += 2;
                }

            }

            g.setColor(thumbColor);
            g.fillRect(0, 0, thumbBounds.width - 2, thumbBounds.height - 1);

            g.setColor(thumbShadow);
            g.drawRect(0, 0, thumbBounds.width - 2, thumbBounds.height - 1);

            g.setColor(thumbHighlightColor);
            g.drawLine(1, 1, thumbBounds.width - 3, 1);
            g.drawLine(1, 1, 1, thumbBounds.height - 2);

            paintBumps(g, c, 3, 4, thumbBounds.width - 6, thumbBounds.height - 7);

            if (!isFreeStanding) {
                if (!leftToRight) {
                    thumbBounds.width -= 1;
                    g.translate(1, 0);
                } else {
                    thumbBounds.width -= 2;
                }
            }
        } else { // HORIZONTAL
            if (!isFreeStanding) {
                thumbBounds.height += 2;
            }

            g.setColor(thumbColor);
            g.fillRect(0, 0, thumbBounds.width - 1, thumbBounds.height - 2);

            g.setColor(thumbShadow);
            g.drawRect(0, 0, thumbBounds.width - 1, thumbBounds.height - 2);

            g.setColor(thumbHighlightColor);
            g.drawLine(1, 1, thumbBounds.width - 2, 1);
            g.drawLine(1, 1, 1, thumbBounds.height - 3);

            paintBumps(g, c, 4, 3, thumbBounds.width - 7, thumbBounds.height - 6);

            if (!isFreeStanding) {
                thumbBounds.height -= 2;
            }
        }
        g.translate(-thumbBounds.x, -thumbBounds.y);

        if (PlasticUtils.is3D(PROPERTY_PREFIX))
            paintThumb3D(g, thumbBounds);

    }


    private void paintBumps(Graphics g, JComponent c, int x, int y, int width, int height) {
        if (!useNarrowBumps()) {
            bumps.setBumpArea(width, height);
            bumps.paintIcon(c, g, x, y);
        } else {
            int maxWidth = UIManager.getInt(MAX_BUMPS_WIDTH_KEY);
            int myWidth = Math.min(maxWidth, width);
            int myHeight = Math.min(maxWidth, height);
            int myX = x + (width - myWidth) / 2;
            int myY = y + (height - myHeight) / 2;
            bumps.setBumpArea(myWidth, myHeight);
            bumps.paintIcon(c, g, myX, myY);
        }
    }


    private void paintThumb3D(Graphics g, Rectangle thumbBounds) {
        boolean isHorizontal = scrollbar.getOrientation() == Adjustable.HORIZONTAL;
        int width = thumbBounds.width - (isHorizontal ? 3 : 1);
        int height = thumbBounds.height - (isHorizontal ? 1 : 3);
        Rectangle r = new Rectangle(thumbBounds.x + 2, thumbBounds.y + 2, width, height);
        PlasticUtils.addLight3DEffekt(g, r, isHorizontal);
    }

    // Accessing Special Client Properties **********************************************

    private boolean useNarrowBumps() {
        Object value = UIManager.get(MAX_BUMPS_WIDTH_KEY);
        return value != null && value instanceof Integer;
    }
}